Motor power supply control apparatus
First Claim
1. A motor power supply control apparatus including a DC power supply part having a pair of power supply terminals, and an inverter having a pair of connection terminals connected to each other by an additional line, respectively, connected to the pair of power supply terminals of the DC power supply part to receive DC power from the DC power supply part and to supply AC power to a motor, the motor power supply control apparatus comprising:
- a power supply line connecting the pair of connection terminals to each other;
a braking resistor disposed in the power supply line connecting the pair of connection terminals to each other;
a control switching element disposed in series with the braking resistor in the additional line;
a braking switch disposed to one of the connection terminals and switching to either a normal position connecting the one of the connection terminals to a corresponding power supply terminal, or a braking position connecting the one of the connection terminals to the additional line;
a motor speed detector detecting a speed of the motor;
a control part controlling the braking switch to switch to the braking position and controlling the control switching element so that an on-off interval of the control switching element is controllable depending on the speed detected by the motor speed detector, when the AC motor is in a dynamic braking mode; and
an over voltage protection resistor having a side connected between the braking resistor and the control switching element, and a remaining side connected to the one connection terminal to be placed in series with the control switching element.
1 Assignment
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Accused Products
Abstract
A motor power supply including a DC supply part having a pair of supply terminals; an inverter having a pair of connection terminals respectively connected to the supply terminals thereof to receive DC power therefrom and to supply AC power to a motor, a breaking resistor and a control switching element disposed in parallel in an additional line connecting the pair of connection terminals to each other, a control switching element disposed with the breaking resistor in the additional line, a breaking switch disposed to one of the connection terminals and switched to either a normal position or a breaking position connecting the one connection terminal to a corresponding supply part or to the additional line, a speed detector detecting a motor speed and a control part controlling the breaking switch to switch to the breaking position and controlling the control switching element so that an on-off interval of the control switching element is controllable depending on the detected speed.
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Citations
33 Claims
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1. A motor power supply control apparatus including a DC power supply part having a pair of power supply terminals, and an inverter having a pair of connection terminals connected to each other by an additional line, respectively, connected to the pair of power supply terminals of the DC power supply part to receive DC power from the DC power supply part and to supply AC power to a motor, the motor power supply control apparatus comprising:
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a power supply line connecting the pair of connection terminals to each other; a braking resistor disposed in the power supply line connecting the pair of connection terminals to each other; a control switching element disposed in series with the braking resistor in the additional line; a braking switch disposed to one of the connection terminals and switching to either a normal position connecting the one of the connection terminals to a corresponding power supply terminal, or a braking position connecting the one of the connection terminals to the additional line; a motor speed detector detecting a speed of the motor; a control part controlling the braking switch to switch to the braking position and controlling the control switching element so that an on-off interval of the control switching element is controllable depending on the speed detected by the motor speed detector, when the AC motor is in a dynamic braking mode; and an over voltage protection resistor having a side connected between the braking resistor and the control switching element, and a remaining side connected to the one connection terminal to be placed in series with the control switching element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power supply including a DC supply control apparatus part having a pair of first terminals, and an inverter having a pair of second terminals, respectively, connectable to the pair of first terminals to supply AC power to a AC motor, the power supply comprising:
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a switching element; a wire connectable across the pair of the second terminals; a braking resistor disposed in series with the switching element in the wire; a braking switch disposed to connect one of the pair of the second terminals to one of a corresponding one of the first terminals, in a normal position of the braking switch and the wire, in a braking position of the braking switch; a speed detector detecting a speed of the motor; a control part controlling the braking switch to switch to the braking position and the switching element so that an on-off interval thereof depends on the speed detected by the speed detector, when the motor is in a dynamic braking mode; and an over voltage protection resistor having a side connected between the braking resistor and the control switching element, and a remaining side connected to the one connection terminal to be placed in series with the control switching element.
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12. A power supply control apparatus including a DC supply unit connected to an inverter to supply AC power to a motor, the power supply comprising:
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a series of a switching element and a braking resistor connectable across input terminals of the inverter; a braking switch disposed to connect one of the input terminals of the inverter to one of the DC supply unit, in a normal position of the braking switch and the series of the switching element and braking resistor; a speed detector detecting a speed of the motor; a control part controlling the braking switch and the switching element so that the braking switch is switched to the braking position and on-off interval of the switching element depends on the speed detected by the speed detector, when the motor is in a dynamic braking mode; and an over voltage protection resistor having a side connected between the braking resistor and the control switching element, and a remaining side connected to the one connection terminal to be placed in series with the control switching element; wherein the speed detector comprises; an encoder coding an angle of a rotation position of the motor and calculating a rotation position and a speed of the AC motor based on an encoded signal, and providing the control part with information of the speed and the angle of the rotation position of the AC motor. - View Dependent Claims (13)
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14. A power supply control apparatus including a DC supply unit connected to an inverter to supply AC power to a motor, the power supply comprising:
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a series of a switching element and a braking resistor connectable across input terminals of the inverter; a braking switch disposed to connect one of the input terminals of the inverter to one of the DC supply unit and the series; a control part detecting the speed of the motor and controlling a switching interval of the switching element according to the detected speed; and an over voltage protection resistor having a side connected between the braking resistor and the control switching element, and a remaining side connected to the one connection terminal to be placed in series with the control switching element. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification